Lens and backlight module having the lens
AssigneeHon Hai Precision Industry Co., Ltd.
InventorI-THUN LIN
Life of this patent
Estimating the term…
Abstract
A lens includes an incident surface and a light output surface. A plurality of light diverging portions is arranged on the light output surface and around a center of the light output surface. The light diverging portions each are a ring and are spaced from each other. An inner light diverging portion has a refraction angle larger than that of an outer light diverging portion. Light emitted into the lens from the incident surface is diffused by the light output surface and the light diverging portions to radiate out of the lens. A cross section of each light diverging portion has a shape of a triangle. The present disclosure also relates a backlight module using the lens.
Claims20
A lens for use in a direct-type backlight module to spread light from a light source to a light diffusion board, comprising:
- a light incident surface located at a lower portion of the lens;
- and
- a light output surface located at an upper portion of the lens and opposite to the light incident surface, a plurality of light diverging portions being arranged on the light output surface of the lens, the light diverging portions being protruded upwardly from a central portion the light output surface and around the a central axis of the lens, refraction angles of the light diverging portions decreasing along a direction from the central axis of the lens toward a periphery of the lens, light travelling through the lens from the light incident surface being refracted by the light output surface and the light diverging portions to uniformly emit out.
A backlight module comprising:
- a substrate;
- a lighting chip mounted on the substrate;
- and
- a lens covering the lighting chip, the lens comprising a light incident surface at a lower portion thereof and a light output surface at an upper portion thereof and opposite to the light incident surface, a plurality of light diverging portions being arranged on the light output surface of the lens, the light diverging portions being protruded upwardly from a central portion of the light output surface and around a center of the light output surface, a refraction angle of an inner light diverging portion being larger than a refraction angle of an outer light diverging portion, light travelling through the lens from the light incident surface being refracted by the light output surface and the light diverging portions to uniformly emit out.
Dependencies are inferred from the claim text.